Janine was always on the fence between fantasy and reality, and sometimes people like that can lose themselves when they face extreme conditions. They'll go past the point of no return, and their perception will completely shatter. If that happened, Janine would've likely been sent off to her death.
Aunt Lydia knew that. She had talked about not wanting to break Janine before. Instead of sending her to a Magdalene colony, she decided to keep Janine at the Red Center, forcing her to clean floors and do menial tasks. Lydia told herself that she'd find a posting for Janine soon--though it didn't seem like she had the heart to do it.
The other aunts hated it. They didn't believe in favoritism. They pushed her to send Janine off to a Magdalene colony, insisting that no commander would want a girl with her history. Lydia hated them for it.
When Esther arrived, Janine overheard them talking about cutting out the girl's tongue. Janine begged Aunt Lydia to show her mercy, so Aunt Lydia agreed to send her down the next morning to talk to Esther.
Janine was able to get Esther to eat, proving that she could be useful to the aunts. Lydia was overjoyed. She had a justification for keeping Janine close.
It was a strange scene with dark implications. Janine seemed to be developing a sense of loyalty towards the aunts. She was glad that she was alive after nearly starving. She knew that Lydia cared about her, and now she was instructing another handmaid to obey. It was odd, and it seemed like the show was grooming her for something.
We know from the sequel that girls who refuse to perform their duty under threat of suicide are sometimes given the opportunity to become aunts in training, and unwomen like Janine have been chosen for that honor from time to time.
Future aunts in training will be dressed in fake pearls and silver dresses, then shipped off to Canada to complete a missionary program. They'll be called Pearl Girls. Will Janine become the first? Will she be admitted as an aunt in training? Will she inspire Lydia to create the Pearl Girl program?
At the very least, we can be certain that Janine will play a part in setting the stage for the spin-off. Since Pearl Girls aren't a thing yet, and Lydia is responsible for creating them, Janine could be connected to them somehow.